METHOD FOR ANALYZING FATTY ACID AND/OR FATTY ACID ESTER IN MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To contribute to the control of the adding quantity of fatty acid, etc., deeply related with abrasion and friction characteristic by separating and analyzing a sample obtained by thermal extraction by a gas chromatograph and mass spectrometer so as to execute qualitative/quantative analysis so as to unnecessitate preprocessing by organic solvent to make rapidly analyzable. ;SOLUTION: Fatty acid and/or fatty acid ester included in a magnetic recording medium constituting layer are thermally extracted at a temperature of 380 to 450°C and separated by a gas chromatograph with steam pressure higher than a fixed limit to give qualitative analysis to the separated matter by a mass spectrometer. A compound is specified from a mass spectrum ranging a wide mass range. In order to eliminate the influence of other components on the other hand, selective ion measuring for detecting as a peak for the quantative of only characteristic mass ion to execute quantative from a peak area by an absolute analytical curve method, etc. Thus, the preprocessing of the sample is also eliminated without using the organic solvent to execute qualitative and quantative analysis with a small amount of the sample, speedily and while considering environment.;COPYRIGHT: (C)1999,JPO